A three-colour ratio and removal

A three-colour ratio and removal

Secondary 2
4 marks
TGM Original Questions

Core stretch

A bag contains 98 red, blue and green marbles in the ratio \(3:5:x\). The probability of green exceeds the probability of red by \(\frac{3}{14}\). One marble is selected at random.

  1. Find \(x\).[2]
  2. Seven blue marbles are removed. Find the probability that the next marble is blue.[2]

Solution:

Solution locked

Sign in to view the step-by-step solution

Please join our E Math programme to search for similar questions for more practice.

E Math Tuition
Answer:(a) \(x=6\) (b) \(\frac{4}{13}\).

Need help? Join our JC Math tuition classes.

Learn more